Markets surged this week as investors bet data showing prices fell year-on-year in the eurozone in December would push the ECB to launch massive
purchases of government bonds, only to slump back on indications it may act cautiously.
"We are seeing persistent weak inflation, due to among other things the prices of energy and food having fallen sharply," Lautenschläger said in an interview with the weekly Der Spiegel due to hit newsstands on Saturday.
The 0.2 percent drop in consumer prices is the first fall in consumer price inflation in the eurozone in five years, and many analysts warn low energy prices could keep prices falling for an extended period.
Deflation is defined as an extended period of falling prices where consumers begin to put off purchases in expectation they will fall further, sparking a damaging cycle of falling production, employment and prices.
The ECB has been watching warily as inflation fell further away from its target level of just under 2 percent last year as oil prices tumbled by half.
ECB chief Mario Draghi has said the central bank could launch a quantitative easing (QE) programme of purchasing government bonds like the US
Federal Reserve did during the global financial crisis to protect the eurozone from deflation. Some analysts see the ECB as now having little choice to do so
at its next meeting on January 22.
But Lautenschläger, who was formerly a deputy head of the German central bank, said "the purchase of sovereign bonds is for me the last option in monetary policy."
"The benefits and the risks of such a programme should counterbalance in a reasonable manner, and for me that isn't currently the case," she added.
Germany has voiced its reserves to the ECB launching a QE programme, including Bundesbank chief Jens Weidmann, who also sits on the ECB's governing council.
Draghi has said the ECB's staff were asked to draft possible models for a QE programme. Bloomberg news agency reported on Friday that the ECB governing council has been presented scenarios including purchases of up to 500 billion euros ($59 billion) in investment-grade assets.
Markets were disappointed with that amount which is only half of the 1.0 trillion euros in the expansion in its balance sheet that the ECB has targeted
to ward off deflation.
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